GDChart Test

	Simple chart (`GDC_3DBAR`) Other styles: `GDC_AREA` `GDC_BAR` `GDC_LINE` `GDC_3DAREA` `GDC_3DLINE`
	Floating bar chart (`GDC_3DFLOATINGBAR`) Other style: `GDC_FLOATINGBAR`
	Pie chart (`GDC_3DPIE`) Other style: `GDC_2DPIE` Transparent background.
	Combo chart (`GDC_3DCOMBO_LINE_BAR`) Other styles: `GDC_COMBO_LINE_AREA` `GDC_COMBO_LINE_BAR` `GDC_COMBO_LINE_LINE` `GDC_3DCOMBO_LINE_AREA` `GDC_3DCOMBO_LINE_LINE`
	Hi-lo-close chart (`GDC_3DHILOCLOSE`) Other style: `GDC_HILOCLOSE` Created with `cStringIO`. GIF format.
	Combo hi-lo-close chart (`GDC_3DCOMBO_HLC_AREA`) Other styles: `GDC_COMBO_HLC_AREA` `GDC_COMBO_HLC_BAR` `GDC_3DCOMBO_HLC_BAR` JPEG format, default quality.
	Some other options: Annotation. Scatter. Background image.